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2 – Theory of Operation

T1 CrossConnect Installation & Operation Manual

Version 2

GatesAir

2-11

Intraplex Products

Figure 2-10. Unidirectional Ring Configuration—Failure between Sites C and D

By its nature, the unidirectional ring dedicates a time slot all the way around the ring for each

communications circuit, no matter how short. In this example, the circuit of interest was between two

adjacent nodes, (A and B) but a time slot was required all the way around the ring to complete the

unidirectional path.

2.4.2.2 Counter-Rotating Rings

For networks requiring a large number of “short hops” around the ring, it would be more efficient to

re-use time slots as we progress around the ring, which the counter-rotating ring accomplishes. Figure

2-11 shows a single T1 ring programmed in a counter-rotating configuration. Bi-directional traffic flow

is shown between sites A and B and between sites C and D. As in the unidirectional ring, the traffic

from site A travels clockwise to site B. However, the return traffic travels on the inner path in a

counter-clockwise direction from site B back to site A. Since (under normal conditions) this traffic

never travels around the rest of the ring, the time slots can be re-used for traffic between sites C and

D. In fact, separate circuits could also use these same time slots for independent traffic between sites

B and C and sites D and A.

Содержание Intraplex T1 DCS-9530 CrossConnect System

Страница 1: ...r com Intraplex T1 CrossConnect DCS 9500 CrossConnect System 1RU DCS 9530 CrossConnect System 3RU DCS 9560 CrossConnect System 3RU DCS 9565 CrossConnect System 3RU Version 2 Installation and Operation...

Страница 2: ......

Страница 3: ...anges in equipment design specifications components or documentation as progress may warrant to improve the performance of the product GatesAir reserves the right without notice to make such changes i...

Страница 4: ...Version numbers usually correspond to software releases If the manual versions differ in number from the release the front page shows both the manual version and the release version...

Страница 5: ...4 8 1 MA 216 Module Adapter 1 7 1 4 8 2 MA 251A and MA 252A Module Adapter2 1 7 1 4 8 3 MA 255A and C Module Adapters 1 7 1 4 9 Power Supply 1 7 Section 2 Theory of Operation 2 1 2 1 CrossConnect Con...

Страница 6: ...ptional 3 7 3 4 2 1 MA 216 External Timing Connectors 3 7 3 4 2 2 MA 251A and MA 252A External Timing In Connectors 3 8 3 4 3 Remote Port Wiring Optional 3 8 3 4 3 1 MA 216 Remote Ports 3 9 3 4 3 2 MA...

Страница 7: ...2 Addition of DCS as Device 5 4 5 3 3 Auto Detect 5 6 5 3 4 Settings Review and Change 5 8 5 3 4 1 General Tab 5 8 5 3 4 2 Port Tabs 5 9 5 3 4 3 Map Control Tab 5 9 5 3 4 4 RBS Control Tab 5 11 5 3 4...

Страница 8: ...6 14 ISiCL Commands Used to Mange the System Clock 6 15 6 14 1 DCS System Clock Setting 6 16 6 14 2 DCS Software Query for Clock Information 6 16 6 15 ISiCL Commands Used for Mapping 6 17 6 15 1 MAP...

Страница 9: ...specifications for T1 CrossConnect Systems and Servers 1 2 Product Overview The Intraplex DCS 9500 and DCS 9530 CrossConnect Systems and the Intraplex DCS 9560 and DCS 9565 CrossConnect Servers provid...

Страница 10: ...ew of your system may look slightly different if it uses different module adapters Figure 1 1 DCS 9500 Front closed Figure 1 2 DCS 9500 Front 0pen Figure 1 3 DCS 9500 Rear MA 255C Configuration Shown...

Страница 11: ...undant power supply and the ability to use either AC or DC power supply modules 1 3 3 DCS 9560 CrossConnect Server The CrossConnect Server provides terminal multiplexing time slot cross connect and gr...

Страница 12: ...9 DCS 9560 Rear MA 216 and MA 255C Configuration Shown 1 3 4 DCS 9565 CrossConnect Server The DCS 9565 provides drop and insert multiplexing time slot cross connect and time slot grooming capability...

Страница 13: ...Rack Unit Chassis for CrossConnect System The DCS 9500 mainframe chassis is a one rack unit 19 inch wide by 1 75 inch high equipment shelf The chassis houses one power supply a CrossConnect module a...

Страница 14: ...nctionality of this module and the setup of the multiplexing section of the Access Server Control and signal connections to the CM 5 are made through an MA 216 module adapter on the rear panel 1 4 5 C...

Страница 15: ...ol port External timing I O The MA 252A is used only with the DCS 9500 Section 3 Installation Wiring gives connector and pin assignment information for the MA 251A and MA 252A 1 4 8 3 MA 255A and C Mo...

Страница 16: ...kes place by a process known as time slot interchange Each incoming T1 is captured and disassembled into time slots Each disassembled time slot is then stored in a CrossConnect matrix circuit on the D...

Страница 17: ...as one of these ways Requested clock The clock source selected by the user or by the DCS software to replace the current system clock Actual clock The clock source currently driving the DCS system clo...

Страница 18: ...if no alternate has been set Clock slippage is the detection of two clock waveforms out of synchronization A slip detect circuit compares the waveform of the actual clock to the waveform of the refere...

Страница 19: ...clock port 1 3 A synchronization detection circuit compares the waveform on port 3 to the waveform on port 1 4 When the signals of the actual clock source port 3 and the reference clock source port 1...

Страница 20: ...Figure 2 1 Process Flow for Switchover Examples 2 2 T1 Circuit Routing 2 2 1 Loopback Configuration The loopback configuration provides the bidirectional connection of a channel back to itself Figure...

Страница 21: ...ough configuration provides a connection of one channel to another Figure 2 3 Figure 2 3 Pass through Configuration 2 3 Grooming Applications 2 3 1 Point to Multipoint Systems Point to multipoint syst...

Страница 22: ...ide backup paths for T1 signals A T1 signal on the incoming path is routed to the backup path when the primary path fails During normal operation a DCS monitors the status of the primary path The DCS...

Страница 23: ...path for traffic to follow during failure conditions Rings can be implemented using CrossConnect Systems or Servers interconnected in a continuous ring or loop Figure 2 8 shows a single T1 ring confi...

Страница 24: ...ions are identical for each of these rings However based on the expected traffic patterns in the network one configuration or the other may prove more efficient in use of available T1 capacity around...

Страница 25: ...ystem at site C redirects the traffic normally sent toward site D back around the ring in the opposite direction toward site B using the normally empty inner counter clockwise path The CrossConnect Sy...

Страница 26: ...s around the ring it would be more efficient to re use time slots as we progress around the ring which the counter rotating ring accomplishes Figure 2 11 shows a single T1 ring programmed in a counter...

Страница 27: ...rnate maps as they did in the unidirectional ring However instead of re routing an entire T1 only the active time slots half of the total are re routed Usually the lower numbered time slots 1 to 12 ar...

Страница 28: ...n be provided over a single T1 counter rotating ring is realized in the unlikely case where all the circuits are single hop connections Each time slot can be re used for additional circuits in each se...

Страница 29: ...C requiring double the available capacity For this application the counter rotating ring can only provide 12 of the required circuits and the unidirectional ring is clearly more efficient Another exa...

Страница 30: ...Server shelf CrossConnect Systems and CrossConnect Servers can be mixed in ring networks based on the termination requirements at each site 2 4 2 6 Extra Traffic One consistent characteristic of prot...

Страница 31: ...Server The multiplexer part of a DCS 9560 serves as an interface between a single T1 high speed circuit and multiple voice and data low speed circuits Figure 2 14 Channel modules convert voice data or...

Страница 32: ...two different locations With the Figure 2 15 configuration you can drop twice as many DS0 circuits as you can with only one CM 5 module These circuits provide locally terminated services such as voice...

Страница 33: ...nels connect to the multiplexer via module adapters that plug in at the rear of the shelf Appendix A of the individual channel module manuals provides detailed descriptions of each module adapter and...

Страница 34: ...modules already installed All modules and module adapters can remain in place while bolting the shelf into its equipment rack To install the CrossConnect equipment perform these steps 1 Make sure all...

Страница 35: ...are operating If a shelf is equipped with two power supplies main and redundant and one of the supplies fails it may be removed and a new supply inserted without powering down the system 3 4 Wiring Th...

Страница 36: ...ssConnect Installation Operation Manual 3 Installation Wiring Version 2 3 4 GatesAir Intraplex Products Figure 3 4 MA 251A and MA 252A Module Adapter Connectors Figure 3 5 MA 255A Module Adapter Conne...

Страница 37: ...ion Manual Version 2 GatesAir 3 5 Intraplex Products Figure 3 6 MA 255C Module Adapter Connectors Figure 3 7 DCS 9500 RJ 45 System Rear Panel Connectors Figure 3 8 DCS 9560 DB 15 System Rear Panel Con...

Страница 38: ...t the pin assignments to make your own Table 3 1 lists the pin assignments for the MA 216 and MA 255A T1 port Table 3 2 lists the pin assignments for the MA 255C T1 port Table 3 3 lists the pin assign...

Страница 39: ...used as an external T1 timing source by other equipment Timing In is a balanced 1 544 MHz RS 422 input to the corresponding CM 5 that may be connected to an external T1 timing source The CM 5 synchro...

Страница 40: ...jack cables and a PC adapter On a DCS 9565 with drop and insert multiplexer each of the two CM 5 modules is controlled from the remote port on its corresponding MA 216 so each must be connected separ...

Страница 41: ...jack pin assignments 4 Insert an RJ 11 plug into the RS 232 RS 485 remote port on the MA 216 of each CM 5 module 5 Use Table 3 7 to set the RJ 11 jack pin assignments 6 Connect the other end of each p...

Страница 42: ...ns 1 and 6 provide daisy chain connection for the remote port data signals to multiple multiplexers at one location Table 3 9 Pin Assignments for MA 251A and MA 252A RS 485 Port RJ 11 Connector Pin De...

Страница 43: ...of Three or More DCS Units The MA 251A 252A module adapter default bias resistor setting is ON To turn off the bias resistor remove the jumpers from JMP3 JMP4 and JMP5 All three jumpers must be remov...

Страница 44: ...ions using the RS 485 are isolated so the bias resistor can remain turned on for all the DCS units However a null modem cable not included is needed to swap the transmit and receive when running from...

Страница 45: ...external contacts to select a map Table 3 11 shows the relationship of pins to map selection To select a map connect between the map input and ground pin 8 Table 3 11 Pin Input Signals for MA 251A an...

Страница 46: ...olling feature of the MA 251A 252A module adapter allows the module adapter to poll the DCS for the current map number The map number is reported on the module adapter map output contact the DB 15 con...

Страница 47: ...of each type in the chassis in the Quantity column Multiply the quantity by the power consumption to determine the total power consumption for all modules of that type When you are finished add up all...

Страница 48: ...erminal of the station battery tied to ground 4 If the shelf contains one or more Foreign Exchange Station End modules used for Automatic Ring Down or Off Premise Extension connect RING GEN to externa...

Страница 49: ...age source when this is needed by one or more channel modules This input may also be connected to an external loop current generator WARNING This voltage source must be externally fused or its current...

Страница 50: ...lation Wiring Version 2 3 18 GatesAir Intraplex Products 3 4 5 3 Power Connections for the DCS 9500 Figure 3 17 AC Power Connections for DCS 9500 3 4 5 4 Power Connections for the DCS 9530 9560 9565 F...

Страница 51: ...n the power supply module five lights and one switch All the indicator lights are either ON or OFF there is no transition state such as a green light changing to yellow or orange before turning red Wh...

Страница 52: ...these indications FAIL ALARM When this red light is on two or more primary paths have been lost This light has additional indications in the DCS 9560 and DCS 9565 multiplexers the Access Server Instal...

Страница 53: ...ower has not been wired to the shelf 5 Observe that each CM 5 module displays its current mode setting TERM DI A or DI B for several seconds after power is first applied To view the mode setting remov...

Страница 54: ...indication signal AIS all ones signal Bit error rate BER threshold exceeded Remote alarm Execution of a command with ISiCL or IntraGuide that is map switching is remotely initiated by either User Auto...

Страница 55: ...ority routing critical traffic not interrupted in event of a failure Cost cutting In addition you can later use any underutilized time slots as your operations expand One example of cutting the cost o...

Страница 56: ...very time slot is specified by a port number and a time slot number ISiCL and IntraGuide express these numbers a little differently Table 4 2 Specifying Time Slots Application Port 1 Time Slot 9 Port...

Страница 57: ...onfiguration in ISiCL All the time slots for each port map to the same time slot on the same port Figure 4 3 shows the equivalent IntraGuide map Table 4 3 ISiCL Map for Loopback Configuration Port 1 1...

Страница 58: ...and unidirectional traffic from port 1 to port 5 and from port 2 to port 6 This also demonstrates multi drop or broadcast operation since the signal received on port 1 is transmitted on ports 3 and 5...

Страница 59: ...Port 3 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 Port 4 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 2 13 2 14 2 15 2 16 2 17...

Страница 60: ...5 does not include Port 6 because it is not involved in the point to multipoint transmissions The map shows all the time slots broadcasting from port 1 Table 4 5 ISiCL Map for Point to multipoint Conf...

Страница 61: ...rst a different signal goes to each location and the transmission is duplex Figure 4 8 Figure 4 8 Simple Interchange Configuration Suppose that port 1 is located at a station that has four live channe...

Страница 62: ...nt to multipoint transmissions Table 4 6 ISiCL Map for Simple Interchange Configuration Port 1 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 2 24 3 24 4 24 5 24 1 23...

Страница 63: ...interchange with a point to multipoint configuration Figure 4 10 Complex Interchange Configuration Table 4 7 and Figure 4 11 show the map for this example of interchange configuration The ISiCL map sh...

Страница 64: ...11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 Port 2 1 1 1 2 1 3 1 4 1 1 3 1 4 1 1 8 1 9 1 10 1 11 1 12 1 13 1 14 1 15 1 16 1 17 1 18 1 19 1 20 1 21 1 22 1 23 1 24 Port 3 1 1 1 2...

Страница 65: ...13 gives the equivalent IntraGuide map Table 4 8 ISiCL Map 0 for Point to point Protection Switching Port 1 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 3 11 3 12 3 13 3 14 3 15 3 16 3 17 3 18 3 19 3 20...

Страница 66: ...rt 6 Figure 4 14 shows the equivalent IntraGuide map Table 4 9 ISiCL Map 3 for Point to point Protection Switching Port 1 5 1 5 2 5 3 5 4 5 5 5 6 5 7 5 8 5 9 5 10 5 11 5 12 5 13 5 14 5 15 5 16 5 17 5...

Страница 67: ...his case the user must disable the unused ports A failure in a path does not cause a change in operation or an alarm if the port for that path has been disabled Before switching the DCS waits a select...

Страница 68: ...uide with the T1 CrossConnect products IntraGuide requires a PC with Pentium 100 MHz 32Mb RAM Microsoft Windows 95 Windows 98 or WindowsNT 4 0 with Service Pack version 4 0 or higher 4Mb of free disk...

Страница 69: ...nstallation Operation Manual 5 Configuration Using IntraGuide Version 2 5 2 GatesAir Intraplex Products Figure 5 1 PC Connected Directly to Node Using RS 232 Cable Figure 5 2 PC Connected to Node from...

Страница 70: ...on the equipment shelf either directly or remotely using a modem 4 Run a communications program such as HyperTerminal to set the communications parameters Table 5 1 Table 5 1 Communications Parameters...

Страница 71: ...or you can just run Auto Detect to discover all the modules including the DCS Because the processor module the CM 95 and the DCS are internally connected by the CrossConnect bus IntraGuide recognizes...

Страница 72: ...figuration Window 3 In the Device Type field select CM 95 DCS appears in the Card Address field 4 In the Communications Port field select a communications port 1 through 4 5 In the Address field selec...

Страница 73: ...addresses for the devices in your system from the first address to the last but the discovery process takes longer than if you run Auto Detect in several discovery sessions with smaller address range...

Страница 74: ...Click Next The Select COM Port dialog box appears Figure 5 7 Figure 5 7 Select COM Port Dialog Box 5 Click a communications port on the list 6 Click Next The final wizard dialog box appears Figure 5...

Страница 75: ...should be blank Figure 5 9 Section 2 1 5 DCS System Clock and Section 6 14 ISiCL Commands Used to Manage the System Clock give more information about the DCS system clock Map recovery delay is the amo...

Страница 76: ...seconds Figure 5 10 Figure 5 10 Ports 1 2 Tab Configuration Pane Line build out is the required minimum strength level of the transmitted T1 signal You can set this on a port by port basis It indicate...

Страница 77: ...ese steps 1 In the Configuration pane on the Map Control tab Figure 5 11 click Edit Maps A progress dialog box indicates that IntraGuide is communicating with the DCS and reading in the current map co...

Страница 78: ...me slot for RBS perform these steps 1 Click the RBS Control tab Figure 5 13 RBS Control Tab Configuration Pane 2 Select the time slot or time slots to enable robbed bit signaling 3 Click Apply Now to...

Страница 79: ...guration Pane To set up a secondary port perform these steps 1 Select the primary Port from the list 2 Select the check box next to the Secondary Port Pre Qualifier port 3 Click Apply Now 5 3 4 6 Port...

Страница 80: ...by clicking New on the File menu to create the file and then adding devices or running Auto Detect to discover the devices IntraGuide saves the file with an icf IntraGuide Configuration File extensio...

Страница 81: ...n you create the map file Therefore it is helpful to give the map file a name that matches the name of the configuration file if you want to keep the association clear For example when saving a config...

Страница 82: ...ives remote port pin assignments 6 1 2 Handshaking ISiCL does not support hardware or software flow control or handshaking which is not an issue when entering ISiCL commands manually from a terminal o...

Страница 83: ...er Installation Operation Manual The CM 95 DCS processor module address can only be set by remote control 6 3 1 Address Numbers Valid ISiCL addresses are the integers from 1 to 63 or no address field...

Страница 84: ...example 13 DCS SET CLOCK 1 2 Response OK CONFIG Lists the configuration settings for the module named in the subaddress field Section 6 4 The parameter field in a CONFIG command should be left blank...

Страница 85: ...also allows a free form comment to be included after the command between the semicolon and the carriage return 13 DCS SET NORMALMAP 7 Set normal service map to 7 Anything typed in the comment field th...

Страница 86: ...s are immediately followed by a carriage return and line feed cr lf 6 9 Alert Alarm Status Check You can determine the overall alert and alarm status of a DCS by issuing a STATUS command to its CM 95...

Страница 87: ...CS SET Parameters and Legal Values Parameter Function Legal Value Sets Parameter To ACT1 Port 1 active not active ON Port 1 in service OFF Port 1 not in service ACT2 Port 2 active not active ON Port 2...

Страница 88: ...24 RxP Rx Port number 1 to 6 0 constant RxC Rx Port Channel number 1 to 24 if RxP 0 then RxC the constant value Note A constant can be entered in decimal or hexadecimal format as decimal 255 hexadecim...

Страница 89: ...cified port to have robbed bit signaling enabled where p port number 1 to 6 n1 n2 n3 hexadecimal numbers which encode the selected time slots Section 6 10 2 Robbed Bit Signaling Specification gives mo...

Страница 90: ...to zero In the bit mask grouping for n2 to set the fifth bit for time slot 13 TS13 to one specify a value for n2 of 0x10 in hexadecimal format Table 6 3 gives the values to set time slot 13 to robbed...

Страница 91: ...mmand DACS STATUS while products shipped after that date respond to either DCS STATUS or DACS STATUS commands Table 6 4 Valid DCS STATUS Parameters and Responses Parameter Possible Response Descriptio...

Страница 92: ...Current accumulated unframed all ones CRYEL ARYEL Current accumulated receive yellow remote alarm CRCL ARCL Current average number of carrier loss CL alarms CRLOS ARLOS Current average number of loss...

Страница 93: ...ondition on off FAIL Failure condition on off 6 12 DCS CONFIG Parameters You can check the configuration setup of a CrossConnect System or Server using the CONFIG command Using CONFIG with one of the...

Страница 94: ...all 24 DS0 mappings for map 0 port 1 DCS CONFIG DS0 0 would return all 24 DS0 mappings for each of the six ports in map 0 DCS CONFIG DS0 would return all 24 DS0 mappings for each of the six ports in...

Страница 95: ...port p yes no LOSDLY p Loss of synch delay port p NORM p Normal switching mode NODE p Critical node loss of all ports if failure MPORT p Enable Multiple Port port p SPORT p 1 Secondary Port 1 SPORT p...

Страница 96: ...it word Start bit 1 Sop bit 1 Parity None 2 Make all necessary hardware connections 3 Execute the ISiCL default STATUS command A response to this command confirms that the communications port is worki...

Страница 97: ...ommand SET CLOCK INT Although the alternate clock source is optional the primary is not Possible values for the CLOCK parameter when specifying the primary clock source are 1 to 6 EXT or INT Possible...

Страница 98: ...rce a particular map ON for testing purposes for example to clear a circuit After the circuit is cleared you should set the map to OFF and resume operation with the normal service map All maps should...

Страница 99: ...change the map number under the default conditions use this command DACS SET MAP x ON where MAP x 0 7 6 15 4 DS0 Parameter The DS0 parameter allows you to specify time slot settings on a port by port...

Страница 100: ...1 is active ACT1 flag has been set ON and is reporting no problems PORT 2 Green when Port 2 is active ACT2 flag has been set ON and is reporting no problems PORT 3 Green when Port 3 is active ACT3 fla...

Страница 101: ...rated voice data video and program audio applications DCS 9565 6 port T1 CrossConnect Server 3 RU package Up to 48 DS0 terminations Includes the functions of the DCS 9500 Accepts Intraplex plug in cha...

Страница 102: ...rt Alarm DCS Port Status Alert Alarm Contact Closures Shelf Alert Alarm DCS Alert Alarm Active Map Indicators Diagnostics T1 and time slot loopback Remote Access Functionality Remote programming and m...

Страница 103: ...Premises Equipment to 1 544 Mbps and or Subrate Digital Services in Section 8 3 must be completed by the installer 8 In the event of equipment malfunction all repairs should be performed by our Compa...

Страница 104: ...Equivalence Numbers of all the devices does not exceed 5 8 3 Certification Submit the affidavit on the next page to the telephone company This affidavit is required if you use digital terminal equipme...

Страница 105: ...adjustment of the digital CPE with respect to encoded analog content and encoded billing information continuously complies with Part 68 of the FCC s Rules and Regulations The digital CPE does not tra...

Страница 106: ...Name demonstrate compliance with the information as provided in the proceeding paragraph if so requested _________________________________ Signature _________________________________ Title ___________...

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